u/Good-Conclusion-9508

I’m looking to book a train ticket from Krakow to Zakopane. Does anyone know how busy these trains get? I noticed trains sell out of tickets in a way that they don’t on UK trains. Is this because they have reached capacity which means we should get a seat if we have a ticket? Or is there standing in the aisles?
We’ll also have small suitcases so wondering if there is space?

Thanks!